notes: Frame Relay Back to Back FR

- Are router-to-router serial links running frame-relay encapsulation, but with no frame-relay switch in between to do LMI.
- For back-to-back links two things are required:
- Disable LMI keepalives with "no keepalives".
- Configure one side as a DCE end with a clock rate.
- Any DLCIs can be used, provided both sides have the same DLCIs configured.


config-set:

R4:

interface Serial0/1
ip address 155.1.45.4 255.255.255.0
encapsulation frame-relay
no keepalive
frame-relay map ip 155.1.45.5 514 broadcast

R5:

interface Serial0/1
ip address 155.1.45.5 255.255.255.0
encapsulation frame-relay
no keepalive
clock rate 64000
frame-relay map ip 155.1.45.4 514 broadcast